Marking rubberized material



Dec. 22, 1931. c, MAYNARD 1,837,461

MARKING RUBBERIZED MATERIAL Original Filed June 2, 1928- //V Vf/VTOP.

Char/es foyer Nqynard.

A TTOPNE Patented Dec. 22, 1931 UNITED PATENT;- OFFICEZ GHARLES EDGAR" MAYNARD, on" NORTHAMr'roN, MASSACHUSETTS, AssiGNOamo'rnE FISK RUBBER COMPANY, OF cnrcornn FALLS, mssncnusnrrs, A CORPORAT ON F MASSACHUSETTS MARKING RUBBER IZEDtMA'IERIAL Original application filed .Tune 2, 1928, Serial N 0. 282,322. Divided and this application filed September 11, 1929. Serial N. 391,853. I i i My invention relates to a method of marking continuous sheets of material and-more particularly to a method for marking continuous sheets of rubberizedcord or woven fabric such as is used in the manufacture of pneumatic tires. It has for one object the provision of a marking which may be 1mprinted on both sides of rubberized material and which without damaging the material and without the use of any marking agent will be easily distinguishable. Other objects will be apparent from the specification and claims. 7

The marking of rubberized cord'or fabric stock for use in pneumatic tires has, up to the present, as far as applicant is aware, been a problem which has never been satisfactorily solved. The large production of the many grades of pneumatic tires now manufactured necessarily demands many grades of rubberized cord or fabric stock used in their manufacture. As it is very difiicult to distinguish by appearance between the different grades of rubberized stock, it is advantageous to use some identifying means as it is calendered. Marking crayon was tried but found unsatisfactory as it introduces foreign matter into the finished tire, thus weakening its construction. Rubber cement has also been used and found objec tionable due to the maintenance necessary and the relatively high cost of the materials used. My invention successfully overcomes all of these objections. In the attached drawings I have disclosed one manner of carrying out my method, the mechanism shown being claimed in my cO-pending application, Patent No. 1,748,300, dated F ebruary 25, 1930, of which application the present is a division.

Fig. 1 is a perspective view of my invention, marking material coming from calender rolls;

Fig. 2 is a sectional view of one of the marking roll supporting and positioning members; p r V Fig. 3 is a sectional view of the marking rolls; r Fig. l is a partial view taken on line 44. of Fig. 1 showing the locking bar; and

Fig. 5 is-a view of-a pieceof material showing the'identifying marks on both sides Asindioated on the drawings,10 represents a frame on whicharemountedbearings .11 supporting a shaft12 (Fig. 1)." Keyedto the shaft12-are two. wheels 13 (Fig.2) each having eight equally spaced radial guideways 14 and bolted on side plates15. Around theperipher I of wheel 13 are bolted indexing blocks 16. Confined in the radial guideways 14 byball'bearings l7 'are'marking' rollers 18 which bear spacing collars 19 and marking e 20 F gsand 3). the l t r b i sb l to the rolls 18 by bolts 21 at different angles as "showman Fig. 1. For clearness only two such marking-rollersar'e shown in the drawings. but it will be obviousthatsix more,

each with different marking dies 20, maybe added by simply removing the correct indeX ing blocks 16, inserting the'marking-r'ollers and reboltingthe indexing blocks.

Positioned below the marking rollers"18 and in the same vertical plane as shaft l2fi's a roller 22 supported by bearings 23 to the frame" 10 and over which travels therubberized stock 24" from calender rolls "25'.

"Linked to the bearingsll by links 26 is a locking bar 27-'(Fig. 4) kept in the correct verticalalignment by guiding slots in the ex tensions 28 of bearings 11. When the locking bar 27 is in theffull line position shown in Fig.4 it engages sl0ts'29 in theuppermost indexingblocklfi on eachwheel 13 lJOiPOSltion the diametrically. opposite markingrolle'r 18in operating relationwith the rollerg22 as shown in Fig. 2. Any of the other marking rollers may be brought to 'thisposition by raising the lockingbar 27 to thedotted line positionshown in Fig fliand rotating the Wheels 13 to the correct indexing blocks 16.

As is shown in Fig. 2 the spacing collars 19 on the marking roller 18 rest on roll 22 and the ball bearing 17 engages the guideways 14 to prevent any horizontal movement but to allow a free vertical movement of the marking roller 18 thus giving the latter a floating roll action and, as the roll 22 is rotated by the stock 24, the spacing collars 19 will rotate the marking roller in the opposite direction (see Fig. 3)

The faces of themarking dies 20 are kept at a constant separation from the roll 22 by the spacing collars 19 (see Fig. 3) but as the separation is less than the thickness of the rubberized stock 24 the marking dies-20 produce an impression 30 on each side of the stock 24 as shown in Figs. 3 and 5. The weight of the combined marking roller 18, spacing collar 19, etc, is enough to overcome thearesistanceof the warm rubber so that the spacing collar 19 engages the roll 22 at all times.

The separation between the face of the marking dies20 and the roll 22 is governed by the. dimensions of the spacing collars 19 and .has been fround from experiment to be critical in somuch as too littleseparation may permitthe dies -to cut the .imbedded cords 31 andtoo greata separation will notproduce a satisfactory marking. Following is aitypical example witha rollweighing approximately 120 :pounds -1 11 Average thickness of stock Depth of compression needed for imprinting .033 Separation between marking dies and 'roll .017

The warm rubber is in a condition to flow sufiiciently easily to be displaced by the pressure of the die and this displacement takes place, asshown in Fig. 3, on botlrsides of the material ifboth sides are coated. Preferably the spacing of the dies from roll 22 is such that, assuming the material to be a cord fabric, a relatively thin film of rubber is left over the cords at the points of impression with the result that the lines of thecords show sufficiently to give the marking a characteristic lined appearance easily distinguishable from the relatively smooth surrounding surface. This lined effect is indicated in Fig. 5. Whenthe coated 'material is-awoven fabric as distinguished from cord fabric the'marking shows the characteristic weave-of the material. It Will'bG understood that no rubber isremoved and that the marking inno way harms the material.

Having thus described my inventionfI claim:

1.'The method of'marking rubber coated material which comprises displacing the rubbercoating while in a warm condition in 2.

to the portion so treated the characteristic 5 appearance of the underlying material Without completely uncovering the material.

CHARLES EDGAR. MAYNARD. 

